My boyfriend went skinny dipping with a bunch of girls and I'm pissed.

My boyfriend of a year got drunk with his friends the other night and went skinny dipping with his friends girlfriend and 2 of her female friends.

He was the only guy there. I only found this out from Facebook.

Am I right to be mad with him?
My boyfriend went skinny dipping with a bunch of girls and I'm pissed.
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